Description: This paper defines the requirements for cooperation of heterogeneous radio
access networks (RANs) and proposes a novel radio resource management (RRM) framework
for support of mobility and quality of service (QoS) in a heterogeneous communication
environment comprising IMT-Advanced and legacy systems. The reference IMT-Advanced
system is the one developed within the IST projectWINNER(IST-2003-507581 ProjectWireless
Initiative New Radio, http://www.ist-winner.org). The RRM mechanisms are evolved
from traditional ones to comply with the requirements imposed by a simplified new (RAN)
architecture as proposed for IMT-Advanced systems. The RRM mechanisms are evaluated
for the scenario of intra-RAN and inter-RAN user mobility. The RRM framework incorporates
as novelty improved triggering mechanisms, a network-controlledmobility management
scheme with policy enforcement on different levels in the RANarchitecture, and a distributed
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